2-diethylaminoethylmercapto and 2-morpholinoethylmercapto-chloropyridines



United States Patent 3,370,059 2 DIETHYLAMINOETHYLMERCAPTO AND 2- MORPHOLINOETHYLMERCAPTO CHLORO- PYRIDINES Wilhelm A. Schuler, Bad Homburg, and Helmut Beschlte, 5 Frankfurt am Main, Germany, assignors to Deutsche Goldund Silber-Scheideanstalt vormals Roessler, Frankfurt am Main, Germany N0 Drawing. Continuation-impart of application Ser. No. 267,335, Mar. 22, 1963. This application Apr. 15, 1965, Ser. No. 448,235 Claims priority, application Germany, Mar. 27, 1962, D 38,499; Jan. 23, 1963, D 40,747 3 Claims. (Cl. 260-247.1)

This is a continuation-in-part of application Ser. No. 267,335, filed Mar. 22, 1963, now abandoned.

The present invention relates to novel pyridine ties of the general formula derivawherein the Cl substituent indicated is in position 3, 5 or 6, as well as their salts and quaternary ammonium compounds.

In such formula Hal . in WhlCh Hal 1s chlorine or bromlne with a compound of the formula The reaction preferably is carried out at raised temperatures with the aid of bas1c condensing agents such as potash, sodium ethylate or other basic substances such .as tertiary amines.

It also is possible to condense a pyridine derivative of the formula with a compound of the formula Hal-AlkN=Z preferably in an inert solvent and in the presence of basic agents such as sodium ethylate or sodium amide at raised temperatures.

Finally, the compounds according to the invention may 3,370,059 Patented Feb. 20, 1968 ICC also be obtained by reaction of a compound of the general formula N X-Alk Httl with an amine of the general formula preferably in an inert solvent using basic condensing agents, for example potassium carbonate.

The bases which are produced can be converted into their acid addition salts or quaternary ammonium compounds. Preferably, acids having pharmaceutically acceptable anions such as hydrochloric, sulfuric, phosphoric, maleic and the like acids .are employed in the preparation of the salts but, of course, any given salt is easily convertible into any other more desired salt or the free base.

The following examples will serve to illustrate the invention with reference to several specific embodiments thereof. In such examples the proportions are given by weight unless otherwise specified.

Example 1 20 parts of a 50% suspension of sodium amide in toluene were added to 32 parts of morpholinoethylmercaptan dissolved in 300 parts of xylene and the mixture heated under reflux until gas evolution ceased. Thereafter 33 parts of 2,3-dichloropyridine dissolved in 200 parts of xylene were added dropwise and the mixture refluxed for an hour. After cooling down water was added to the reaction mixture and the xylene layer extracted with dilute HCl at a pH of 4. The aqueous acid extract was then neutralized with NaOH and extracted with ether. The ether extract was dried and distilled under vacuum. 32 parts of 2-(morpholino-ethyl-mercapto)-3- chloropyridine distilled over at 164168 C. at 0.5 mm.

Hg pressure. The hydrochloride thereof precipitated from isopropanol and recrystallized has a melting point of 181 C. 0

Example 2 43 parts of a 50% suspension of sodium amide in toluene were added to parts of 2-hydroxy-6-chloropyridine dissolved in 750 parts of toluene and the mixture refluxed. Thereafter 70 parts of dimethylaminoethyl chloride were added dropwise and the mixture refluxed for a further 3 hours. The reaction mixture was processed as in Example 1 and 53 parts of 2-(dimethylaminoethoxy) 6-chloropyridine of a boiling point of -122 C. at 11 mm. Hg pressure recovered therefrom. The hydrochloride thereof melts at 146l48 C.

Example 3 The process of Example 2 was repeated using dimethylaminopropyl chloride instead of dimethylaminoethyl chloride. The resulting Z-(dimethylaminopropoxy)6-chloropyridine had a boiling point of 134-138 C. at 10 mm. Hg. The hydrochloride thereof had a melting point of 181-183 C.

Example 4 2-(morpholinoethylmercapto)6-chloropyridine was obtained analogously to Example 1 using 2,6-dichloropyridine instead of 2,3-dichloropyridine. The hydrochloride thereof had a melting point of 163-165 C.

Example 5 24 parts of a 50% sodium amide suspension in toluene were added dropwise to a solution of 44 parts of morpholinopropanol in 300 parts of toluene boiling under reflux. After the reaction had ended 45 parts of 2,3-dichloropyridine dissolved in 200 parts of toluene were added dropwise and the reaction refluxed for a further 2 hours. The reaction mixture was poured into water and the toluene layer extracted with dilute HCl at a pH of 4 and the resulting aqueous acid extract alkalized and extracted with ether. The ether extract was dried and distilled under vacuum. 63 parts of 2-(morpholinopropoxy)-3-chloropyridine distilled over at 149151.C. at 1 mm. Hg. The hydrochloride was produced with isopropanolic HCl and crystallized from isopropanol. Its melting point Was 151-162 C.

Example 6 Analogously to Example 1, 2 (morpholinoethylmercapto)-3-methylpyridine was obtained using 2-bromo- 3-methylpyridine in place of the 2, 3-dichloropyridine. The hydrochloride thereof had a melting point of 169-171 C.

Example 7 Analogously to Example 6, 2-(n1orpholinopropoxy)-6- chloropyridine was obtained using 2,6-dichloropyridine instead of 2,3-dic'hloropyn'dine. The hydrochloride thereof had a melting point of 164-167 C.

Example 8 Analogously to Example 1, Z-(piperidinoethylmercapto)-3-chloropyridine was obtained using piperidinoethylrnercaptan instead of morpholinoethylmercaptan. The hydrochloride thereof had a melting point of 181- 183 C.

Example 9 7 parts of sodium were dissolved in 200 parts of ethanol and 42 parts of diethylaminoethylmercaptan and 47 parts of 2,5-dichloropyridine were added to the resulting solution. The ethanol was distilled off while stirring and the reaction mixture then maintained at 150 C. for 2 hours. The reaction product was extracted with dilute HCl, such extract alkalized and extracted with ether and the ether extract dried and distilled. 61 parts of 2-(diethylaminoethylmercapto)-5-chloropyridine distilled over at 121-124 C. at 1 torr. The hydrochloride thereof has a melting point of 162163 C.

ill

4 Example 10 8 parts of sodium were dissolved in 200 parts of ethanol and 47 parts of diethylaminoethylmercaptan and 52 parts of 2,6-dichloropyridine were added to the resulting solution. The ethanol was distilled off while stirring and the reaction mixture then heated for 1 hour at C. The reaction product was extracted and distilled as in Example 9. 68 parts of 2-(diethylaminoethylmercapto)-6-chloropyridine distilled over at 136-14l C. at 2 torr. The hydrochloride thereof has a melting point of l98 C.

Example 11 29 parts of morpholino-n-propanol were dissolved in 250 parts of xylene and 16 parts of sodium amide (50% in toluene) added thereto while stirring under reflux. After the reaction ended, 30 parts of 2,5-dichloropyridine dissolved in 50 parts of xylene were added gradually. After the addition was completed the reaction mixture was boiled for a further 2 hours. The product was washed with water and distilled. 38 parts of 2-(morpholino-npropoxy)-5-chloropyridine distilled over at l torr. The hydrochloride thereof has a melting point of 174-175 C.

Example 12 References Cited Semonsky et 211., Chemical Abstracts, vol. 50, p. 3438i (1956).

Musante et al., Chemical Abstracts, vol. 50, p. 986a (1956).

ALEX MAZEL, Primary Examiner.

J. TOVAR, Assistant Examiner. 

1. 2-(DIETHYLAMINOETHYLMERCAPTO)-6-CHLOROPYRIDINE.
 2. 2-(MORPHOLINOETHYLMERCAPTO)-6-CHLOROPYRIDINE. 